Hello, I have been working in a food factory in Qingpu District for one year. The company didn't sign a labor contract with me, nor did it pay me social security. How can I protect my rights?

First of all, make sure the company delays signing the labor contract for you for one year. Paying social security is a violation of the labor contract law. However, since you have three labor contracts signed by the company with you, how can you say that the company has not signed a labor contract with you? You can apply to the local labor and social security bureau for labor arbitration and ask the company to pay you one year's pension insurance and medical insurance, but you should pay attention to the fact that the company has no evidence of paying pension insurance and medical insurance for you, otherwise you will not win the case.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.